I am a little surprised that no one mentioned Van Dyke.
...First of all, the advice of using a negative that is suitable for regular silver printing is *not* accurate. You need a dense neg, of contrast index 1.5 to 1.8. Plus, the papers popular for DOP Pt/Pd (Arches Platine and Cot320) are *not* good for Ziatype- they have too much chalk for ammonium based processes...
Well, I have to intervene:
First, log 1.5 - 1.8 is a pretty low DR for Ziatype. My own negatives have a DR of log 2.8 - 2.9 (full range) and I'm sure the process can handle even more.
Second, COT320 is perfect for Ziatype and absolutely doesn't contain chalk. Any paper that contains chalk will not be suitable for any of the iron process. COT320 is more than fine with both New Cyanotype and Argyrotype. (Both notorious when it comes to paper choices...) Have you actually tried to print on COT320?
BTW, you'll definitely get anemic Ziatypes with log 1.5-1.8 negatives with whatever paper you use...
Regards,
Loris.
Well, I have to intervene:
First, log 1.5 - 1.8 is a pretty low DR for Ziatype. My own negatives have a DR of log 2.8 - 2.9 (full range) and I'm sure the process can handle even more.
Second, COT320 is perfect for Ziatype and absolutely doesn't contain chalk. Any paper that contains chalk will not be suitable for any of the iron process. COT320 is more than fine with both New Cyanotype and Argyrotype. (Both notorious when it comes to paper choices...) Have you actually tried to print on COT320?
BTW, you'll definitely get anemic Ziatypes with log 1.5-1.8 negatives with whatever paper you use...
Regards,
Loris.
I'm pretty much in agreement with Loris here. I made ziatypes for years and the process is quite flexible. Cot320 and Arches Platine will work fine for zias (as well as other papers). Whoever said that those papers are alkaline are just incorrect. Cot320 works well with all iron based processes, along with traditional and new cyanotype. I even know a person who uses it to do straight gum printing. And Arches Platine worked fine for me as well.
Also a negative doesn't need to be dense, just have the right contrast range. I will say I've printed zia directly from negs that print easily on silver but they were pyro stained. Non stained negs that work well for silver may not print well on zia coatings.
Making a fine Ziatype print is demanding, but isn't that true of any process?
I would also encourage anyone interested in working with the ziatype process to try using all of the ammonia based compounds sold by B&S along with other additives. Ziatypes are extremely flexible.
If you can find a copy get Weese and Sullivan's book, 'The New Platinum Print'.
Finally, Ware does have his own ammonia based pop palladium process, just check out his web site.
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